单项选择题

It can be concluded from the passage that the author's attitude toward "sex selection" is ______.

A．negative
B．positive
C．neutral
D．favorable
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单项选择题
The gender of the baby is decided by ______.
A．the father's DNA
B．the mother's DNA
C．the father's sperm
D．the mother's egg
单项选择题
According to this passage, the practice of sex selection ______.
A．can help to prevent all genetic problems
B．is totally unacceptable to ethics experts
C．was already realized five hundred years ago
D．will benefit families with certain inheritable diseases
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